Nec B58944 Datasheet Extra Quality Free May 2026

The NEC B58944 is a specialized integrated circuit (IC) widely recognized within the automotive electronics industry. If you are searching for the NEC B58944 datasheet, it is essential to understand that this part is an OEM-specific (Original Equipment Manufacturer) component, often appearing in Bosch automotive Engine Control Units (ECUs).

This guide provides technical insights into its specifications, equivalents, and how to access relevant data for repair or design. Technical Overview of NEC B58944

The NEC B58944 is primarily identified as a SRAM (Static Random Access Memory) chip or an ECU driver, typically housed in an SOP-28 package. In automotive applications, it serves as a critical memory buffer or driver for managing temporary data during engine operation.

Standard Equivalent: The industry-standard equivalent for the NEC B58944 is the μPD43256BGU-70Y (or μPD43256 series). Memory Architecture: 256 Kbit (32K x 8 bits) Parallel SRAM. Package Type: SOP-28 (Small Outline Package with 28 pins).

Access Time: Typically 70ns (indicated by the "-70" suffix). Common Applications

You will most frequently encounter the B58944 in Bosch ECUs for various vehicle models, including: Honda: ME7.x series. Volvo: EDC16 series. Iveco: EDC7 and EDC16 controllers. Audi/VW: ME7.5 and ME7.5.10 units.

Because this IC is a "vulnerable" component (prone to failure due to thermal stress or voltage spikes), it is a common target for automotive ECU repair professionals. How to Download the NEC B58944 Datasheet for Free

Since "B58944" is a proprietary house number, searching for it directly on standard datasheet portals might return limited results. To find the full technical specifications for free, search for its commercial counterpart:

Search for μPD43256B: Use the Alldatasheet or DatasheetArchive to find the original NEC/Renesas μPD43256B datasheet.

Verify the Package: Ensure the datasheet covers the SOP-28 variant to match the B58944's physical footprint.

Check ECU Fix Sites: Specialist automotive repositories like ECUFix or Inovauto often host pinout diagrams and repair guides specifically for the B58944. Key Specifications to Look For

When reviewing the μPD43256B (B58944) datasheet, pay close attention to these parameters: Supply Voltage ( VCCcap V sub cap C cap C end-sub

): Usually 5V for automotive units, though low-voltage versions (3.3V) exist.

Operating Temperature: Automotive grades often require -40°C to +85°C or higher. Pin Configuration: Match the Chip Enable ( CEcap C cap E ), Output Enable ( OEcap O cap E ), and Write Enable ( WEcap W cap E ) pins to ensure compatibility during replacement.

The NEC B58944 is a specialized automotive integrated circuit, frequently used as a memory chip in Bosch Engine Control Units (ECUs). It is functionally equivalent to the μPD43256BGU-70L, a 256 Kbit CMOS static RAM. nec b58944 datasheet Free

Below is a draft post for a technical forum or social media group to help others find or understand this component.

📝 Post Draft: Troubleshooting Bosch ECUs with the NEC B58944

Title: Technical Brief: NEC B58944 (μPD43256BGU) in Automotive ECU Repair

If you’re working on automotive engine control modules, particularly those from Bosch, you’ve likely come across the NEC B58944. This chip is a common point of failure on many circuit boards and is essential for proper engine computer function. Key Technical Specs: Type: Parallel Static RAM (SRAM). Density: 256 Kib (32K x 8 bits). Package: SO-28 (Small Outline 28-pin). Equivalent Part: μPD43256BGU-70L (NEC Electronics).

Application: Commonly used as an automotive engine drive chip in ECU boards. Repair Notes:

Blank Chips: Replacement B58944 chips are typically sold "empty"—meaning they do not come with pre-loaded programs or data.

Fragility: This IC is known to be a "damaged-prone" part during ECU repairs; always ensure proper ESD precautions and heat management when soldering.

Datasheet Access:You can find full technical parameters and PDF documentation for the μPD43256BGU series (the commercial equivalent) on major databases like AllDatasheet or Elparts.

#ECURepair #AutomotiveElectronics #NEC #BoschECU #B58944 #ElectronicsEngineering NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

NEC B58944 Datasheet: A Comprehensive Guide

The NEC B58944 is a highly sought-after electronic component that has garnered significant attention in the industry. As a result, many individuals and organizations are on the lookout for a reliable and free datasheet for this component. In this article, we will provide an in-depth overview of the NEC B58944, its features, and applications, as well as guide you on how to obtain a free datasheet.

Introduction to NEC B58944

The NEC B58944 is a type of N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) designed for high-speed switching applications. Manufactured by NEC Corporation, a renowned Japanese electronics company, this component is widely used in various electronic devices, including power supplies, motor control systems, and audio equipment.

Key Features of NEC B58944

The NEC B58944 boasts an impressive set of features that make it an ideal choice for many applications. Some of its key features include:

Applications of NEC B58944

The NEC B58944 is a versatile component that finds applications in various fields, including:

Obtaining a Free NEC B58944 Datasheet

A datasheet is a crucial document that provides detailed information about a component, including its features, specifications, and applications. If you're looking for a free NEC B58944 datasheet, here are some steps you can follow:

  1. Manufacturer's website: The first place to look for a datasheet is the manufacturer's website. Visit the NEC Corporation website and search for the B58944 component. You can download the datasheet in PDF format.
  2. Online datasheet databases: There are several online databases that provide free datasheets for various electronic components. Some popular databases include:
    • Datasheet catalog: This website provides a comprehensive database of datasheets for various electronic components, including the NEC B58944.
    • Digchip: This website offers a vast collection of datasheets for electronic components, including the NEC B58944.
    • Component search engine: This website allows you to search for datasheets of various electronic components, including the NEC B58944.
  3. File sharing platforms: You can also search for the datasheet on file sharing platforms like Google Drive or Dropbox. Some users may have uploaded the datasheet to these platforms, making it available for free download.

Conclusion

The NEC B58944 is a highly versatile component that finds applications in various fields. Obtaining a free datasheet for this component is relatively easy, thanks to the numerous online resources available. By following the steps outlined in this article, you can easily access a free NEC B58944 datasheet and take advantage of its features and specifications.

Free NEC B58944 Datasheet Download Links

For your convenience, here are some free NEC B58944 datasheet download links:

By downloading the datasheet, you can gain in-depth knowledge about the NEC B58944 component and its applications, enabling you to make informed decisions for your projects.

The NEC B58944 (often cross-referenced as D43256BGU-70Y) is a specialized integrated circuit primarily used as an Engine Control Unit (ECU) memory or driver chip in Bosch automotive systems.

Finding a standalone "free" datasheet for this specific part number is difficult because it is an OEM-specific component rather than a general-purpose electronic part. However, it is fundamentally a 32K x 8-bit Static RAM (SRAM) chip. Technical Identification Primary Function: Automotive engine ECU memory/drive chip. Package Type: SOP-28 (Small Outline Package with 28 pins).

Generic Equivalent: For technical specifications, you should refer to the NEC D43256 series datasheet. The suffix "-70Y" typically indicates a 70ns access time.

Common Application: Used extensively in Bosch ECU repair for engine computers. Where to Access Data & Documentation The NEC B58944 is a specialized integrated circuit

Since this is an automotive-grade legacy part, official public datasheets from NEC (now Renesas) are rare. You can find technical details and purchase options through these specialized resources:

SRAM Technical Data: Search for the NEC D43256 datasheet on platforms like AllDataSheet to see the pinout and timing diagrams, as the B58944 is a customized version of this memory chip.

ECU Repair Guides: Websites like ECUFixTool and Inovauto provide context for its use in Bosch modules and often host community-driven repair documentation.

Component Sourcing: If you need a replacement, vendors like Jotrin Electronics maintain inventory and basic product detail pages for this specific OEM number. Important Note for Repairs

The B58944 is frequently sold as an "empty chip," meaning it does not contain pre-programmed software or data. If you are replacing this in an ECU, you may need to transfer or flash the existing firmware from the old chip to the new one for the engine to function. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com NEC B58944 ECU DRIVER SOP-28. Inovauto.com NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

I understand you're looking for a free datasheet for the NEC B58944. However, I need to let you know that:

  1. The part number "B58944" does not appear to be a standard NEC (now Renesas) semiconductor part number in their common line-up (like 2SC/B, µPD, etc.). It may be:

    • A custom/OEM part number (used by a specific device manufacturer, e.g., in a TV, monitor, or power supply).
    • A marking code (top marking on a small component), not the full part number.
    • A transistor, diode, or IC with a partial or misremembered number.

  2. Free sources to try (but search by possible correct part):

    • DatasheetArchive (datasheetarchive.com)
    • Alldatasheet (alldatasheet.com)
    • DatasheetCatalog (datasheetcatalog.com)
    • Renesas Electronics (successor to NEC) – official site

  3. What you can do to find it:

    • Check the full marking on the component (e.g., B58944 might be a lot code, date code, or partial).
    • Look at the circuit/device it came from (power supply, amplifier, driver) – that helps identify likely part type.
    • Search for "B58944 NEC" but also try removing "NEC" or adding "datasheet" in quotes.
    • If it's a transistor, check cross-references to 2SB** or 2SC** series.

  4. Ethical note:

    • Free datasheet sites are generally tolerated for older/discontinued parts, but official sources are best.
    • I cannot directly provide or link to copyrighted datasheets, but I can help you identify the correct part number if you provide:
      • Photo of component markings
      • Device make/model it came from
      • Package type (TO-220, SOT-23, etc.)

Would you like help decoding the marking, finding a replacement, or identifying the actual part number instead?

I understand you're looking for the NEC B58944 datasheet for free. However, I need to be upfront with you: I cannot directly provide or host the PDF file, as that would likely violate copyright.

Here is a practical, actionable post/guide to help you find the datasheet yourself, along with important technical context.

Typical Applications

Application Circuit Principles

The IC works on a two-stage conversion principle: High-speed switching : The NEC B58944 has a

  1. DC-DC Conversion (Boost): It uses an inductor to step up the low DC input voltage to a high DC voltage (stored on an external "tank" capacitor).
  2. DC-AC Conversion (H-Bridge): It then uses an internal H-bridge (or equivalent switching topology) to convert that high DC voltage into a high-voltage AC waveform to drive the EL lamp.

Title: How to Access the NEC B58944 Datasheet for Free (Full Guide)